The meeting with the Queen is an "on appointment" audience, offered to new Prime Ministers from countries of which the monarch is head of state.

Ardern also took part in a meeting of the Five Eyes leaders overnight with Australia's Malcolm Turnbull, Canada's PM Justin Trudeau and the UK's prime minister Theresa May to discuss Syria and other matters of interest. The fifth member of the Five Eyes group - the US - did not have a representative at the meeting.

Earlier in the day, she had a one-on-one meeting with Theresa May at Downing Street.